I think it kinda depends on how serious your gonna get. I remember when i took PCP once, it surely blocks out pain and makes you feel invincible, But i got suicidal thoughts, which my friends could not really talk me out of... go with Halo, when i was on it, i was aggressive as hell, but to add an extra effect i used Methyl T about 40 minutes before the fight.
Also you may want to take up some sort of Martial Art style great for self defense... I have been taking Muay Thai for a while now and I can say it is great. Learn Muay Thai..... and break some ribs
Good Luck